A political crisis continues to build after President Trump’s order to close the borders to refugees and visitors from the predominantly Muslim countries (Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen).

Amid protests over the weekend, the White House pulled back on part of the temporary ban, and as of Sunday night, officials said no one was being held at U.S. airports. Some lawyers disagreed.

• What we know about the ban.

The order created uncertainty about the U.S. immigration system. Legal residents from those countries were affected at first, but they are now exempt.

How we got here: Mr. Trump’s plan received little or no legal review. The secretary of homeland security was not asked for guidance, and Customs and Border Protection officers were unaware.

Those affected:We collected the stories of people covered by the ban, which delayed families from reuniting and students at American universities from returning.

The next steps: Judges in at least four cities ruled that the president had moved too quickly, the first steps in litigation that may last years.

• Elsewhere in the Trump administration.

Mr. Trump said today that he would reveal his choice for the vacant Supreme Court seat on Tuesday at 8 p.m. Eastern, in a televised announcement from the White House.

Separately, the president gave Stephen K. Bannon, his chief strategist, a full seat on the “principals committee” of the National Security Council.

While elevating his adviser to a position alongside the secretaries of state and defense, Mr. Trump downgraded the roles on the committee of the chairman of the Joint Chiefs of Staff and the director of national intelligence.

• Terrorist attack in Canada.

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The attack at the Islamic Cultural Center of Quebec on Monday came after Prime Minister Justin Trudeau said that Canada would continue to welcome refugees from terrorism and war.CreditAndre Pichette/European Pressphoto Agency

Gunmen opened fire in a mosque in Quebec on Sunday night, killing six people and wounding eight others. Two suspects have been arrested.

Precious Land, a 27-year-old working mother, was one of 64 people shot in Chicago over Memorial Day weekend. After over seven months in a coma, she died this month from complications from the gunshot wound. Ms. Land’s family invited The New York Times to be present at her open-casket service.Published OnJan. 30, 2017CreditImage by Joshua Lott for The New York Times. Technology by Samsung.

• Improving mastectomies.

Plastic surgeons performed more than 106,000 breast reconstructions in the U.S. in 2015, up 35 percent from 2000. The results of cutting-edge techniques, however, are often judged on a patient’s appearance.

“What it feels like to the woman has been a kind of blind spot in breast surgery,” one surgeon said.

A rendering of the artificial floating island project in French Polynesia. A waste-management system is among the project’s many hurdles.CreditSeasteading Institute

A California company says it may begin a project in French Polynesia next year.

Smarter Living: Morning Edition

• If you made a New Year’s resolution this year, there’s an 80 percent chance you’ve already given it up or you’re about to. We want to help you stick with it — or revamp it into something you really want to achieve — so Smarter Living is offering tips, advice and motivation.

Every Monday in this space, we’ll pose a new idea, offer advice for staying strong and ask you a question. Every Thursday, we’ll highlight a few of our favorite emails and offer a helping hand.

To join in, email us at smarterliving@nytimes.com with the subject line “My resolution” and send us answers to the following three bullets. I’ll start:

Your name: I’m Tim Herrera, your Smarter Living editor.

Your resolution and why you chose it (either the one you started with, or the one you really want to achieve): My resolution is to be better with money so I can save more and, gasp, maybe actually retire someday.

Two specific sub-goals within your resolution: In February, I’ll order delivery for dinner one fewer night per week, and I’ll stop buying one of my daily afternoon coffees (which I buy solely out of habit, but which cost me around $500 over a year).

An earlier version of this briefing misstated part of the name of the forum on which Stephen K. Bannon has a full seat on the “principals committee.” It is the National Security Council, not the National Security Committee.